气象2023，Vol.49Issue(11)：1343-1358,16.DOI:10.7519/j.issn.1000-0526.2022.122601
双偏振雷达水凝物分类算法优化及在雹暴云的应用分析
The Hydrometeor Classification Optimum Algorithm for Polarimetric Radar and Its Application for the Hailstorm Cloud
摘要
Abstract
To promote the application level of hydrometeor classification for Chinese Doppler polarimetric radar,based on the hydrometeor classification algorithm(HCA)developed by the National Severe Storm Laboratory(NSSL)of the United States,we design an optimum algorithm,named HCA-Opt,by adding the amendatory identification for the hydrometeor in hail and three-body scatter area,using the tempera-ture of the numerical weather model analysis field to detect the location of the melting layer,and integra-ting restricted condition of vertical distribution for all hydrometeors.HCA-Opt is utilized to analyze the distribution characteristics of hydrometeor during a hailstorm cloud weather in Zhangqiu of Jinan City on 9 July 2021,and the location of the hail and the hydrometeor classification result are verified.The conclu-sions are as follows.The type of hydrometeor wrongly recognized as ground clutter by the HCA in the hail and the three-body scatter region can be correctly identified by the HCA-Opt.HCA-Opt can use the tem-perature from model analysis field to accurately identify the height of melting layer,solving the defect that the melting layer could not be detected by the algorithm in severe convective weather in HCA.Compared to HCA,the vertical distribution of hydrometeor identified by HCA-Opt is more reasonable.Besides,the classification result retrieved from the HCA-Opt can better describe the spatial distribution of hydrometeor at newborn and hailfalling stages of hailstorm,and initially reflect the characteristics of phase transforma-tion at different heights.Through the verification,the reliability of the moderate(light)rain and graupel identified by the HCA-Opt is the highest,while that of the crystal and wet snow is lower,and easy to be mixed with the dry snow.Overall,the HCA-Opt can improve the skill of hydrometeor identification to certain extent,provide indicative information for warning and detecting the hailfalling area and have a good operational application prospect.关键词
双偏振雷达/水凝物分类/HCA优化/雹暴Key words
dual polarization radar/hydrometeor classification/HCA optimum/hailstorm分类
大气科学引用本文复制引用
夏凡,龚佃利,潘佳文,史茜..双偏振雷达水凝物分类算法优化及在雹暴云的应用分析[J].气象,2023,49(11):1343-1358,16.基金项目
山东省自然科学基金项目(ZR2022MD072、ZR2021QD028、ZR2020MD052、ZR2020MD053)、中国气象局创新发展专项(CXFZ2022J034)、山东省气象局重点科研项目(2021sdqxz05、2021sdqxz09)共同资助 （ZR2022MD072、ZR2021QD028、ZR2020MD052、ZR2020MD053）
